Quercus macrocalyx

{{Short description|Species of oak tree}}

{{Speciesbox

| image = Quercus Macrocalyx.jpg

| status = LC

| status_system = IUCN3.1

| status_ref = {{cite iucn |author= Carrero, C. |date=2019 |title= Quercus macrocalyx |volume=2019 |page= e.T78968896A78968899 |doi= 10.2305/IUCN.UK.2019-1.RLTS.T78968896A78968899.en |access-date=13 November 2022}}

| genus = Quercus

| display_parents = 2

| parent = Quercus sect. Cyclobalanopsis

| species = macrocalyx

| authority = Hickel & A.Camus

| range_map =

| range_map_caption =

| synonyms = Quercus tsoi Chun ex Menitsky
Quercus megalocarpa A.Camus
Quercus fleuryi Hickel & A.Camus
Cyclobalanopsis nengpulaensis H.Li & Y.C.Hsu
Cyclobalanopsis macrocalyx (Hickel & A.Camus) M.Deng & Z.K.Zhou
Cyclobalanopsis fleuryi (Hickel & A.Camus) W.T.Chun
Cyclobalanopsis austroyunnanensis Hu

}}

Quercus macrocalyx is a tree species in the beech family Fagaceae There are no known subspecies. It is placed in subgenus Cerris, section Cyclobalanopsis.{{Cite web |last1=Denk |first1=Thomas |last2=Grimm |first2=Guido W. |last3=Manos |first3=Paul S. |last4=Deng |first4=Min |last5=Hipp |first5=Andrew L. |date=2017 |title=Appendix 2.1: An updated infrageneric classification of the oaks |website=figshare |doi=10.6084/m9.figshare.5547622.v1 |url=https://figshare.com/articles/dataset/Appendix_2_1_________An_updated_infrageneric_classification_of_the_oaks/5547622/1 |access-date=2023-02-24 |format=xls |name-list-style=amp }}

This oak tree grows up to 20 m tall and has been recorded from Vietnam, where it may be called sồi đấu to.Phạm Hoàng Hộ (2003) Cây Cỏ Việt Nam: an Illustrated Flora of Vietnam vol. II publ. Nhà Xuẩt Bản Trẻ, HCMC, VN